Operational Technology Security & Independent Assurance

Who this service is for

• Transport, built-environment and industrial projects that depend on operational technology.
• System integrators delivering BMS, PLC, SCADA or other control-system environments.
• Critical infrastructure owners that need security requirements translated into practical controls and evidence.
• Projects preparing for factory testing, site testing, commissioning or formal acceptance.
• Organisations that require independent security assessment separate from control implementation.

What the service covers

OT asset, interface and data-flow review

Confirm the systems, controllers, servers, workstations, network devices, external interfaces, management paths and operational dependencies in scope.

Security architecture and network zoning

Design or review security zones, VLANs, trust boundaries, firewall controls, management access, secure protocols, logging paths, backup flows and high-availability requirements.

OT cybersecurity risk assessment

Assess threats, vulnerabilities, operational consequences, existing controls and residual risks across the OT environment and its IT or external interfaces.

Compliance and requirements mapping

Translate tender, regulatory, customer and industry requirements into a traceable set of design controls, verification activities, evidence and accountable owners.

Hardening and security-control review

Review authentication, privileged access, secure configuration, patching, endpoint protection, application control, removable-media controls, logging, monitoring, backup and recovery.

Independent verification and validation

Check whether agreed controls have been implemented correctly, operate as intended and produce the required security outcome. Findings are recorded with evidence and tracked through remediation.

OT vulnerability assessment and penetration testing

Conduct authorised testing under agreed rules of engagement, safe test windows, escalation paths and emergency stop procedures. Testing can include OT networks, servers, workstations, applications and approved management interfaces.

FAT, SAT and pre-commissioning assurance

Prepare security checklists, review test evidence and verify control readiness before the relevant factory, site or commissioning gate.

Cybersecurity documentation and evidence

Prepare or review security plans, design documents, risk registers, verification plans, test reports, gap assessments, hardening evidence, exception registers and requirements traceability records.

Remediation, retesting and handover

Help prioritise findings, confirm corrective actions, complete agreed retesting and consolidate the final evidence, residual risks and ownership for handover.

Independent assurance and implementation support

Independent assessment must remain separate from the people configuring the controls being assessed. Apexagen defines the roles at the start of the engagement and maintains clear separation between independent risk assessment, verification and testing activities and any implementation or remediation work.

Where implementation support is required, a separate delivery team can configure security infrastructure, network segmentation, privileged access, endpoint protection, logging, backup and other approved controls. For Singapore penetration-testing engagements, testing is performed by a licensed service provider working with Apexagen.

Explore Professional Services & Implementation or review our broader VAPT services.

Standards and requirements we can support

The applicable requirements depend on the system and sector. Engagements can be aligned with project-specific security requirements, Singapore's Cybersecurity Code of Practice for Critical Information Infrastructure, IEC 62443, CENELEC EN 50701 for railway applications, accepted hardening benchmarks and the organisation's own security policies.

What you receive

• Confirmed OT asset, interface and assessment scope.
• Security architecture and data-flow documentation.
• Cybersecurity risk assessment and risk register.
• Requirements and control traceability matrix.
• Verification and validation plan, checklists and test reports.
• Vulnerability assessment and penetration-testing plan and reports.
• Compliance or gap-assessment report where required.
• Prioritised findings, remediation recommendations and retest results.
• Residual-risk, exception and handover records.

How we deliver it

1. Scope: Confirm the operational environment, safety constraints, interfaces, requirements and responsibilities.
2. Assess: Review the architecture, assets, risks and required controls.
3. Verify: Examine configurations, documentation and implementation evidence against the approved requirements.
4. Test: Perform authorised assessment within agreed operational boundaries and escalation procedures.
5. Close: Track remediation, complete agreed retesting and consolidate evidence for commissioning or handover.

Relevant transport infrastructure experience

Apexagen has been engaged to support OT and IT cybersecurity for a multi-site BMS programme within Singapore's transport infrastructure. The scope covers security architecture, cybersecurity risk assessment, independent control verification, vulnerability assessment and penetration testing, compliance documentation and pre-commissioning assurance.